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Bugsnag Notifier for Java

The Bugsnag Notifier for Java gives you instant notification of exceptions thrown from your Java applications. The notifier hooks into Thread.UncaughtExceptionHandler, so any uncaught exceptions in your app will be sent to your Bugsnag dashboard.

Bugsnag captures errors in real-time from your websites and mobile applications, helping you to understand and resolve them as fast as possible. Create a free account to start capturing errors from your applications.

Installation & Setup

  • Download the latest bugsnag.jar and place it in your app's classpath.

    Bugsnag for Java depends only on the org.json library, download the jar here.

    Note: if your project uses Maven you can instead add bugsnag as a dependency in your pom.xml.

  • Import the Bugsnag Client class in your code and create an instance to begin capturing exceptions:

    import com.bugsnag.Client;
    Client bugsnag = new Client("your-api-key-goes-here");

Sending Custom Data With Exceptions

It is often useful to send additional meta-data about your app, such as information about the currently logged in user, along with any exceptions, to help debug problems. To add custom data to every exception you can use addToTab:

bugsnag.addToTab("User", "Name", "Bob Hoskins");
bugsnag.addToTab("User", "Paying Customer?", true);

Send Non-Fatal Exceptions to Bugsnag

If you would like to send non-fatal exceptions to Bugsnag, you can pass any Throwable object to the notify method:

bugsnag.notify(new RuntimeException("Non-fatal"));

You can also send additional meta-data with your exception:

import com.bugsnag.MetaData;

MetaData metaData = new MetaData();
metaData.addToTab("User", "username", "bob-hoskins");
metaData.addToTab("User", "email", "");

bugsnag.notify(new RuntimeException("Non-fatal"), metaData);



Bugsnag uses the concept of "contexts" to help display and group your errors. Contexts represent what was happening in your application at the time an error occurs.



Bugsnag helps you understand how many of your users are affected by each error. In order to do this, we need to send along user information with every exception.

If you would like to enable this, set the user. You can set the user id, which should be the unique id to represent that user across all your apps, the user's email address and the user's name:

bugsnag.setUser("userId", "", "User Name");


If you would like to distinguish between errors that happen in different stages of the application release process (development, production, etc) you can set the releaseStage that is reported to Bugsnag.


By default this is set to be "production".


By default, we will notify Bugsnag of exceptions that happen in any releaseStage. If you would like to change which release stages notify Bugsnag of exceptions you can call setNotifyReleaseStages:

bugsnag.setNotifyReleaseStages(new String[]{"production", "development"});


By default, we will automatically notify Bugsnag of any fatal exceptions in your application. If you want to stop this from happening, you can call setAutoNotify:



Sets the strings to filter out from the extraData maps before sending them to Bugsnag. Use this if you want to ensure you don't send sensitive data such as passwords, and credit card numbers to our servers. Any keys which contain these strings will be filtered.

bugsnag.setFilters(new String[]{"password", "credit_card_number"});

By default, filters is set to new String[] {"password"};


Sets which package names Bugsnag should consider as "inProject". We mark stacktrace lines as in-project if they originate from any of these packages.

bugsnag.setProjectPackages("", "");


Sets for which exception classes we should not send exceptions to Bugsnag.

bugsnag.setIgnoreClasses("", "com.example.Custom");

Reporting Bugs or Feature Requests

Please report any bugs or feature requests on the github issues page for this project here:



The Bugsnag Java notifier is free software released under the MIT License. See LICENSE.txt for details.